A skin tag, medically known as acrochordon, is a small, benign flap of flesh-colored tissue that hangs off the skin by a small, narrow connecting stalk. They are most often found where skin forms creases and rubs against skin, such as under the armpits, under the breasts, on the groin area, or on the neck and back. Skin tags can be up to half an inch long, though most are about the size of a grain of rice. They do not grow or change over time. Skin tags affect about 46% of the population, and are most commonly found in people who are overweight, have diabetes, and women who are pregnant.